Nano BMP280 weather station.

Smallest one! With 0.66" 64x48 OLED.

Sziklai

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Description

The goal is to make the smallest possible weather station.
It runs on an ATtiny85 with a BMP280 sensor and a tiny 0.66″ SSD1306 OLED.
It draws only 3mA from a 3V coin battery and fits on a 13×15×5mm PCB!
See github for source code or compiled HEX. PCB files provided for jlcpcb.